Radiation Shielding Efficiency of Tungsten Alloy

Tungsten alloy is a tungsten-group sintered alloy consisting of tungsten and a binder phase with nickel, copper, iron, etc. Tungsten alloy is also used as radiation shielding material because of its excellent radiation shielding effect realized by its high density. Recently, due to environmental requirements, Tungsten alloy has attracted attention as replacement for lead which has been used for this application.

On the radiation shielding effect of tungsten alloy, we examined a comparative evaluation with lead. Fig.1 shows the attenuation rate of γ-ray (Co60) against the change in thickness of tungsten alloy and lead. The γ-ray (Co60) used for the evaluation this time is that eradiated from relatively a high energy zone, which becomes an issue in the case of nuclear power station.

This evaluation proves that tungsten alloy of about 3mm or 7mm thickness has the radiation shielding effect equivalent to lead of about 4.5mm or 10mm thickness respectively. consequently, tungsten alloy, compared with lead, has 1.5 times shielding effect against γ-ray (Co60).

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